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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a89d920c6c0d4c2970358b61db658d3b1a1f8f74045362fe2ad105c3990b37a' 
  AND token = '/QVk12MzBIDZGDIazO0R1a+0ZjLxjZusKz3gheQdd74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}